A 40-year-old Mountain House man was killed and another person injured Saturday during a boat crash on the Old River near Brentwood.

About11:30 a.m. Saturday, a boat cruising through the delta waterways apparently hit an object in the water before striking the base of a railroad bridge near Cruiser Haven Marina, said Jimmy Lee, a spokesman for the Contra Costa County Sheriff's Department.

About 5:15 p.m., rescue workers found a man's body near the crash scene, Lee said. The boat's other passenger suffered minor injuries and was treated at the scene, Lee said.